Denso BTH-300BW User Manual page 33

The functions of the keys can be set by user programs. Shown below is a set of sample functions.
Cursor keys (F5 to F8)
Used to move up to the
preceding line, down to the next
line, to the preceding character,
and to the next character.
Numerical keys
Used for data input.
Trigger switch
(M3 key)
Function keys
Used for choosing
functions.
Power key
Turns the BHT on or off.
BS (Backspace) key
Moves back one
character.
C (Clear) key
Clears the last entered data or
returns to the original screen.
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Trigger switch
(M4 key)
Magic keys (M1 to M4)
Each of the M3 and M4 keys is
assigned a trigger switch by
default.
Depending upon definition in
System Mode or in user programs,
M1 to M4 keys can also be used as
any of the trigger switch, SF key,
ENT key and backlight function
on/off key. These keys can be also
assigned string data.
ENT (Enter) key
Finalizes the input data or operations,
and starts the corresponding
processing.
SF (Shift) key
Used in combination with
numerical keys for special input
procedures.